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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

The lobes of the cerebral hemishphere. The lobes of the cerebral hemishphere.
The cerebral hemispheres and cerebral commissures. The cerebral hemispheres and cerebral commissures.
Organization of the Cerebral Cortex Organization of the Cerebral Cortex
Lateral view of right cerebral hemisphere Lateral view of right cerebral hemisphere
Primary motor area of cerebral cortex Primary motor area of cerebral cortex
Lobes of the brain, with primary receiving and integrating centers of the human cerebral cortex. Lobes of the brain, with primary receiving and integrating centers of the human cerebral cortex.
Video: Prone Position

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